Ireland will need a "reality check" when reviewing their five-try Samoa victory to have any chance of beating Australia, warns boss Joe Schmidt.

The relieved new head coach admitted he was "nervous" ahead of his debut in the Ireland hot seat.

Two tries from debutant replacement Dave Kearney - one set up by older brother Rob - and further scores from Peter O'Mahony, Fergus McFadden and Sean O'Brien eased the former Leinster coach's international initiation.

But Schmidt admitted his side must improve out of sight ahead of their impending Aviva Stadium clash with Australia, in the second weekend of autumn international action.

Schmidt explained: "We'll get a reality check when we look at it again: too many line-breaks from the Samoans.

"And we can't afford to do that against Australia. If they get on top they are extremely dangerous.

"If we open up too many options for them, they will take them.

"We are very, very aware of the threat Australia pose.

"Our kicking out of the hand wasn't as good as it could have been at times.

"If someone manages to find Israel Folau, or Adam Ashley-Cooper next week, then we will find ourselves in trouble."